I wish I could post pictures.
First off this is not a 4 star hotel by Western European or American standards. It is too old and has too many problems to earn that status.
It isn't horrible, but in that typically Eastern-European Slavic way everything is just a little bit messed up, just a little bit off from the way it should be. For example, they chose white carpets for the whole hotel, white carpets which are now horribly stained from the hallways to the bedrooms. I'm sure they looked good, for about a week.
The hallways are not quite level and not quite straight. And there are other architectural failures, like some rooms that don't have balconies or proper windows.
Oh, and then the mold in the shower. And the peeling paint on the ceiling. And the insanely loud bathroom fan that is clearly broken. Peek under or behind any piece of furniture and you're going to find a lot of dust and dirt. They do not properly clean these rooms.
10 Euro to use the sauna, 15 Euro to have a pet with you, crib charge, etc. They stick you with charges everywhere they can.
Again in Slavic fashion, the gym is old but effective. You can actually lift heavy in this gym and do squats and deadlifts. It isn't one of those "cardio and 10 kilo dumbbells only" type Western gyms. So that's nice.